package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * @author aiden
 * @date 2024/2/22 17:34
 */
@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCardMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        // 判断当前加入购物车中的商品是否存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCardMapper.list(shoppingCart);

        // 如果已经存在，只需要将数量+1
        if (list != null && !list.isEmpty()) {
            ShoppingCart cart = list.get(0);
            // update shopping_cart set number = ?
            cart.setNumber(cart.getNumber() + 1);
            shoppingCardMapper.updateNumberById(cart);
        } else {
            // 如果不存在，需要插入一条购物车数据
            // 判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                // 本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(shoppingCartDTO.getDishId());
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                // 本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(String.valueOf(setmealId));
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCardMapper.insert(shoppingCart);
        }
    }

    @Override
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(BaseContext.getCurrentId()).build();
        return shoppingCardMapper.list(shoppingCart);
    }

    @Override
    public void cleanShoppingCart() {
        shoppingCardMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {

        // 查询购物车数据
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCardMapper.list(shoppingCart);

        if (list != null && !list.isEmpty()) {
            ShoppingCart cart = list.get(0);
            Integer number = cart.getNumber();
            if (number > 1) {
                cart.setNumber(cart.getNumber() - 1);
                shoppingCardMapper.updateNumberById(cart);
            } else {
                shoppingCart.setUserId(BaseContext.getCurrentId());
                shoppingCardMapper.deleteByDishIdOrSetmealId(shoppingCart);
            }
        }
    }
}
